Mercury Urine Excretion Test in Arizona

What this test measures

Mercury occurs in different forms, and the body handles each differently. Methylmercury from fish is measured mainly in blood, while inorganic and elemental mercury are more often assessed in urine because the kidneys clear these forms. A urine result therefore gives information about a particular side of exposure rather than a complete picture on its own.

The sample may be a random collection or a timed collection, depending on the order. For a timed collection, all urine produced during the period is saved and the laboratory reports both concentration and total amount when the volume is measured. Specimen validity checks such as creatinine and specific gravity help confirm the collection is complete and usable.

People may order this test for workplace monitoring, after a known or suspected exposure, or to follow up on abnormal blood results. A qualified healthcare provider interprets urine mercury with the timing and route of exposure, kidney function, and any symptoms. The test is not a stand-alone diagnosis.